Neco Model Questions Vol1 2018 Agricultural Science Question 36

Practice objective / multiple choice question 36 from the 2018 Neco Model Questions Vol1 Agricultural Science examination.

Neco Model Questions Vol1 2018 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 36 NECO_MODEL_QUESTIONS_VOL1 • 2018 • AGRICULTURAL_SCIENCE • objective

A tractor's engine can develop a maximum power that varies linearly with its speed according to \(P = k N\), where \(P\) is in kW and \(N\) is the engine speed in rpm. At the rated condition of 2000 rpm the engine produces 45 kW. The engine drives a PTO through a belt drive whose efficiency is 85 %. The PTO must supply 12 kW to operate a rotary harvester. (i) Determine the minimum engine speed (in rpm) at which the tractor must run so that the PTO can deliver the required 12 kW. (ii) If the engine's specific fuel consumption is 210 g kWh\(^{-1}\), calculate the fuel consumption in kilograms per hour when the engine is operating at that speed.

Answer Options

A. Engine speed ≈ 720 rpm; fuel consumption ≈ 3.50 kg h\(^{-1}\).
Correct Answer B. Engine speed ≈ 628 rpm; fuel consumption ≈ 2.96 kg h\(^{-1}\).
C. Engine speed ≈ 590 rpm; fuel consumption ≈ 2.80 kg h\(^{-1}\).
D. Engine speed ≈ 660 rpm; fuel consumption ≈ 3.20 kg h\(^{-1}\).
Correct Answer
B
Correct Option:
Engine speed ≈ 628 rpm; fuel consumption ≈ 2.96 kg h\(^{-1}\).

About This Question

This is Neco Model Questions Vol1 2018 Agricultural Science Question 36. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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